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Even as the industry awaits DOCSIS 1.1 certification completion (reportedly to occur later this month), CableLabs says it's going forward with an updated DOCSIS spec that features advanced modulation methods — and will call it DOCSIS 2.0.

The spec will feature both S-CDMA and A-TDMA modulation, and will allow upstream speeds of 30 Mbps per 6 MHz, with "noise immunity," CableLabs says. By contrast, DOCSIS 1.0 allows 5 Mbps per 6 MHz and 1.1 provides 10 Mbps.

The R&D consortium says the upgrade significantly increases cable bandwidth for data transmission - without physical rebuilding of cable networks. Version 2.0 will be backward compatible with DOCSIS 1.0 and 1.1 cable modems and CMTSs, and allows more protection against cable systems' "electronic impairments," CableLabs says.

The organization says it will begin specification development immediately and expects to finish by year's end.

"We also intend to have our modem project ready to accept any DOCSIS 2.0 devices for certification and qualification in 2002," says Rouzbeh Yassini, CableLabs' executive consultant.

Technology has been under preliminary development since 1998, and CableLabs has worked with such vendors as Broadcom Corp., Conexant Systems, Pacific Broadband Communications, Texas Instruments, and Terayon Corp. - whose proprietary modems already use S-CDMA. CableLabs says that, per its usual method, it is seeking involvement of vendors who want to participate in the specs.

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